一、舊版本的HttpClient獲取Cookies
p.s. 該方式官方已不推薦使用
使用DefaultHttpClient類例項化httpClient物件：

public static String dooPost_deprecated(String url, Map<String, String> map, String charset) {
        DefaultHttpClient httpClient = null;
        HttpPost httpPost = null;
        String result = null;
        try {
            httpClient = new DefaultHttpClient();
 

            httpPost = new HttpPost(url);
            // 設定引數
            List<NameValuePair> list = new ArrayList<NameValuePair>();
            Iterator<Entry<String, String>> iterator = map.entrySet().iterator();
            while (iterator.hasNext()) {
                Entry<String, String> elem = (Entry<String, String>) iterator.next
 
();
                list.add(new BasicNameValuePair(elem.getKey(), elem.getValue()));
            }
            if (list.size() > 0) {
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);
                httpPost.setEntity(entity);
            }
            HttpResponse response = httpClient.execute
 
(httpPost);
            System.out.println(response.getStatusLine().getStatusCode());
            String JSESSIONID = null;
            String cookie_user = null;
            //獲得Cookies
            CookieStore cookieStore = httpClient.getCookieStore();
            List<Cookie> cookies = cookieStore.getCookies();
            for (int i = 0; i < cookies.size(); i++) {
                //遍歷Cookies
                System.out.println(cookies.get(i));
                System.out.println("cookiename=="+cookies.get(i).getName());
                System.out.println("cookieValue=="+cookies.get(i).getValue());
                System.out.println("Domain=="+cookies.get(i).getDomain());
                System.out.println("Path=="+cookies.get(i).getPath());
                System.out.println("Version=="+cookies.get(i).getVersion());

                if (cookies.get(i).getName().equals("JSESSIONID")) {
                    JSESSIONID = cookies.get(i).getValue();
                }
                if (cookies.get(i).getName().equals("cookie_user")) {
                    cookie_user = cookies.get(i).getValue();
                }
            }
            if (cookie_user != null) {
                result = JSESSIONID;
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }

二、新版本的HttpClient獲取Cookies
使用CloseableHttpClient類例項化httpClient物件：

    public static String doPost(Map<String, String> map, String charset) {
        CloseableHttpClient httpClient = null;
        HttpPost httpPost = null;
        String result = null;
        try {
            CookieStore cookieStore = new BasicCookieStore();
            httpClient = HttpClients.custom().setDefaultCookieStore(cookieStore).build();
            httpPost = new HttpPost("http://localhost:8080/testtoolmanagement/LoginServlet");
            List<NameValuePair> list = new ArrayList<NameValuePair>();
            Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator();
            while (iterator.hasNext()) {
                Entry<String, String> elem = (Entry<String, String>) iterator.next();
                list.add(new BasicNameValuePair(elem.getKey(), elem.getValue()));
            }
            if (list.size() > 0) {
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list, charset);
                httpPost.setEntity(entity);
            }
            httpClient.execute(httpPost);
            String JSESSIONID = null;
            String cookie_user = null;
            List<Cookie> cookies = cookieStore.getCookies();
            for (int i = 0; i < cookies.size(); i++) {
                if (cookies.get(i).getName().equals("JSESSIONID")) {
                    JSESSIONID = cookies.get(i).getValue();
                }
                if (cookies.get(i).getName().equals("cookie_user")) {
                    cookie_user = cookies.get(i).getValue();
                }
            }
            if (cookie_user != null) {
                result = JSESSIONID;
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }

HttpClient及其jar包下載地址：官網連結